[U-Boot] U-boot multi-file format

[Diego <diego.ml@zoho.com>]

In data domenica 19 marzo 2017 23:14:14 CEST, Diego ha scritto:
> Hi all,
> 
> I'm trying to use the multi-file format mentioned in pages 12-13 of "U-Boot
> – Multi image booting scenarios" PDF slides.
> 
> I'd like to use FIT format, but I already have units in the field without
> CONFIG_FIT.
> 
> So I'd like to use the legacy U-Boot multi-file format, but I don't
> understand the format that should be used for the ramdisk. I already have a
> multi-file image that boots the kernel with the dtb, but it crashes when
> the ramdisk is needed (looking for an address outside of physical memory
> limits).
> 
> Which format should be used for the ramdisk? ext3.gz initrd? cpio.gz
> initramfs?
> 

Hi all,

as I've found the solution, I'll reply myself in the hope it might help 
somebody in the future.

The format can be both ext3.gz initrd, or cpio.gz, as I've seen a working 
example of ext3.gz initrd here:
https://alteraforum.com/forum/showthread.php?t=51423&p=212064#post212064
And I've been able to make a cpio.gz initramfs by specifying an initrd_high 
address below the location of the multi-file address. Leaving the 
initrd_high=0xffffffff was causing the kernel to not find the ramdisk image, 
thus crashing.

Hope it helps,
Diego